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[FAQ]

The problem is due to overconstraints and equation elimination. Special care is required in the use of MPC for mixed assembly solid/shell/solid. By default, users are used to applying contact only on shells and target on solids, but unfortunately in the particular case of contact on both sides of the shell (each contact belonging to one pair), Mechanical will detect overconstraint status and will deactivate one the contact regions. This may lead to rigid body motion. To avoid this, either alternate contact and shell on both sides of the shell (if MPC contact must be kept) or in case of contact are defined on both shell sides, use penalty method or augmented lagrange instead.